<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>div</title>
</head>
<body>
    <!-- 块标签，一般被用作容器使用 -->
    <div>
        <span></span>
        <button></button>
    </div>

    <section></section>
    <article></article>
    <header></header>
    <aside></aside>
    <footer></footer>
</body>
</html>